Air Blast Circuit Breaker are the desirable features to be found.

Air 🌫️ Blast 💥 Circuit 🧬Breaker ⚓are the desirable features to be found.

The drawback of the oil circuit breakers are the fire risk due the inflammable oil,the deterioration of the oil, necessary periodic replacement and the difficulty of reaching the contacts for maintenance purpose.

                This led to the development of circuit breakers using compressed air or gas as the interrupting medium.

The desirable features to be found in Air blast circuit breakers:-

✍️High speed operation:- The air Blast Circuit Breaker does and arc duration throughout the current range are of the order of one half to one cycle

✍️ Suitability for frequent operation:- Repeated switching by an air blast circuit breakers is possible simply because of absence of air.

✍️ Facility of high speed reclosure:- This by automatic means is an advantage on HV interconnected network to assist and maintain system stability during the clearance of transient faults a type of fault which is perhaps in majority on overhead lines.

✍️ Negligible maintenance:- The ability of the air blast circuit breakers to cope with repeated switching also means that Negligible maintenance is required.

✍️Elimination of fire hazard:- Becouse of absence of oil the risk of fire is eliminated.

✍️ Reduced size:- The growth of dielectric strength is so rapid in air Blast Circuit Breaker that final gap required for arc extinction is very small.

Three types of Air blast circuit breakers:-

१)axial

२)radial

३)cross blast